Assessment of Tear Film Quality among Smokers Using Tear Ferning Patterns

Table 2

Correlation between McMonnies questionnaire scores, PRT, TBUT, TF grades, and duration of smoking within smoker subjects ().

Test/correlation		McMonnies	PRT	TBUT	TF	DS
McMonnies	PC	1	0.101	−0.254	−0.123	0.288
	Sig.	—	0.596	0.175	0.516	0.123
PRT	PC	0.101	1	0.323	−0.302	−0.197
	Sig.	0.596	—	0.082	0.105	0.297
TBUT	PC	−0.254	0.323	1	−0.272
	Sig.	0.175	0.082	—	0.146	0.023
TF	PC	−0.123	−0.302	−0.272	1	−0.258
	Sig.	0.516	0.105	0.146	—	0.168
DS	PC	0.288	0.197		−0.258	1
	Sig.	0.123	0.297	0.023	0.168	—

PC Pearson correlation, DS: duration of smoking, and Sig.: significance (2-tailed).
is significant at the 0.01 level (2-tailed).